java8新特性-Optional类

直接贴代码：

package com.c8a.optional;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.testng.annotations.Test;

import java.util.Optional;



public class OptionalAPI {


    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    static class Person {
        private Boy boy;
        private Girl girl;

        public Person(Girl girl) {
            this.girl = girl;
        }
    }


    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    static class Boy {
        private String name;
    }

    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    static class Girl {
        private String name;
    }

    
    @Test
    public void Test1() {
        Girl girl = new Girl();
//        girl = null;
//        Optional girl1 = Optional.of(girl);


        Optional